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Thread: Frequency of backwashing DE filter

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    jccams's Avatar
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    Frequency of backwashing DE filter

    Since I have been using the BBB method I have noticed my pressure really doesn't move. I know you are supposed to backwash when the pressure rises about 6psi above starting pressure. The question is should you backwash on any frequency if the pressure isn't going up?

    My pressure starts at about 12psi after a backwash, it has been about 6 weeks since the last backwash and it is still at 12 or 13. What do all the experts think?
    24,000 gal vinyl Lazy L, 1 hp pump, DE Filter, Pentair 250K heater, Letro Legend pressure side pool sweep

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    Re: Frequency of backwashing DE filter

    I have sand, just did my first DE filter yesterday, but the principles are the same. In the spring and fall, I have to backwash fairly frequently. In the summer, when there's no pollen or falling leaves, I can go a very long time without backwashing. Without looking at a calendar, it's been around two months since I've backwashed my filter, and I still have a few psi to go before I need to.

    Edit: you added DE back to the filter after the last backwash, right? I know it's obvious, but had to make sure.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: Frequency of backwashing DE filter

    I am not an expert, but I'll share my experience anyway.

    Prior to BBB (several years ago), I had to backwash every 2 - 3 weeks because the pressure on my DE filter had gone from 20 PSI (clean) to 30 PSI (dirty).

    With BBB, I backwash after a 5 PSI increase, which occurs maybe every 2 - 3 months. At 3 months I backwash just because, even if the pressure has only gone up 3 PSI.

    The main cause of PSI increase for me seems to be pollen, when the oak and pecan trees that overhang my pool are in full pollen mode. Otherwise, everything just stays crystal clear.
    31000 Gal IG L-shape w/ spa, Riversand finish (PebbleSheen clone)
    Jandy 60 sq ft DE, 2.5 HP (uprated) Stealth pump, Polaris 280 w/ booster, Jandy PDA PS4 controller

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    jccams's Avatar
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    Re: Frequency of backwashing DE filter

    I did add DE after backwash. I have had the pool for 9 years but always had to backwash every 2-3 week based on pressure rise. Looks like you have confirmed what I thought, just needed a sanity check.
    24,000 gal vinyl Lazy L, 1 hp pump, DE Filter, Pentair 250K heater, Letro Legend pressure side pool sweep

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    Re: Frequency of backwashing DE filter

    If it's any help - I clean my DE filter twice a year and the pool is open year round.

    I dont have any tree problems though so....
    16K Gal Plaster | Compupool SWG | Intelliflow VF | TF-100

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    Re: Frequency of backwashing DE filter

    Your pool chems staying balanced is a major factor in the filter staying clean.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    Re: Frequency of backwashing DE filter

    I also noticed since I do most of my vaccuming with the poolbuster that I don't backwash often once or twice during the six months the pool is open.
    Inground Grecian 20,000 gallons vinyl liner
    Hayward 250 BTU Propane heater
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